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How to use a PS3 controller on Mac OS X 10.7 (Lion)

1. Open Apple menu -> System Preferences -> Bluetooth and disable Bluetooth on Mac as well as any other nearby Macs or devices which will try to pair with and confuse the controller.

2. Reset PS3 controller by inserting paperclip into pinhole near L2 button.

3. Connect PS3 controller to Mac with USB cable.

4. Enable Bluetooth.

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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Backend Development

• node.js
  • Installation paths: use one of these techniques to install node and npm without having to sudo.
  • Node.js HOWTO: Install Node+NPM as user (not root) under Unix OSes
  • Felix's Node.js Guide
  • Creating a REST API using Node.js, Express, and MongoDB
  • Node Cellar Sample Application with Backbone.js, Twitter Bootstrap, Node.js, Express, and MongoDB
  • JavaScript Event Loop
• Node.js for PHP programmers

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Raspberry Pi setup routine

Headless boot to SSH over WiFi

/etc/network/interfaces

auto lo
auto eth0

allow-hotplug wlan0

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#!/usr/bin/env ruby

# Libraries:::::::::::::::::::::::::::::::::::::::::::::::::::::::
require 'rubygems'
require 'sinatra/base'
require 'slim'
require 'sass'
require 'coffee-script'

# Application:::::::::::::::::::::::::::::::::::::::::::::::::::

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# Tell system when Xcode utilities live:
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer

# Set "opendiff" as the default mergetool globally:
git config --global merge.tool opendiff

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require 'bundler/capistrano'

set :application, "net"
set :repository,  "[email protected]:net.git"

set :scm, :git

set :default_environment, {
  'PATH' => "$HOME/.rbenv/shims:$HOME/.rbenv/bin:$PATH"
}

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morse_dict = Hash.new({
	"a" => ".-",
	"b" => "-...",
	"c" => "-.-.",
	"d" => "-..",
	"e" => ".",
	"f" => "..-.",
	"g" => "--.",
	"h" => "....",
	"i" => "..",

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Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

Example

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Deploy Rails app to digitalocean with nginx, unicorn, capistrano & postgres

Create droplet of your liking (ubuntu 12.10 x32)

ssh to root in terminal with your server ip

ssh [email protected]

Add ssh fingerprint and enter password provided in email